That's why I said "they will need to be built in large numbers" and "each ship will need a lot of escorts".
With all due respect, DPRK is neither South Korea nor China. This ship won't be built in dozens.
Also, surface ships by themselves aren't all that resilient since early WW2. Ships are ultimately exposed beings, unless they can hide in wastness of the ocean.
And this is almost impossible against an opponent in full, uncontested control of air and space.
And if the Navy also had its own nuclear asset, that would further enhance the survivability of the nuclear deterrent.
I don't see it. Surface ship is easily trackable and very vulnerable, both within the base and at sea.
All DPRK opponents are much better prepared to take out a surface ship than ground solutions.
This is not a deterrent, it's a frigate, and it is needed first and foremost for frigate tasks. Which include ensuring that the much more viable submarine deterrent works.
If Korean frigate strike is worth something, it's some potential to deter remote weak nations from boarding DPRK ships for big brother. I.e. conventional 3rd party threat, not nuclear. In immediate vicinity of Peninsula, I personally struggle to see any use for those weapons.